Sayyiduna Anas bin Malik (may Allah be pleased with him) said: I took barley bread and melted fat to the Messenger of Allah (peace and blessings be upon him). He had pledged his coat of mail for barley. I heard him say: "The family of Muhammad never has more than one sa' of food in a day." Sayyiduna Anas (may Allah be pleased with him) said: In those days he had nine wives.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الرهن / 11193